Commit 00545bec authored by Pablo Neira Ayuso's avatar Pablo Neira Ayuso
Browse files

netfilter: fix crash during boot if NAT has been compiled built-in


 netfilter: add protocol independent NAT core) introduced a
problem that leads to crashing during boot due to NULL pointer
dereference. It seems that xt_nat calls xt_register_target() before

net/netfilter/x_tables.c:static struct xt_af *xt; is NULL and we crash on
xt_register_target(struct xt_target *target)
        u_int8_t af = target->family;
        int ret;

        ret = mutex_lock_interruptible(&xt[af].mutex);

Fix this by changing the linking order, to make sure that x_tables
comes before xt_nat.
Reported-by: default avatarFlorian Westphal <>
Signed-off-by: default avatarPablo Neira Ayuso <>
parent 1e9f0207
......@@ -47,7 +47,6 @@ nf_nat-y := nf_nat_core.o nf_nat_proto_unknown.o nf_nat_proto_common.o \
nf_nat_proto_udp.o nf_nat_proto_tcp.o nf_nat_helper.o
obj-$(CONFIG_NF_NAT) += nf_nat.o
obj-$(CONFIG_NF_NAT) += xt_nat.o
# NAT protocols (nf_nat)
obj-$(CONFIG_NF_NAT_PROTO_DCCP) += nf_nat_proto_dccp.o
......@@ -71,6 +70,7 @@ obj-$(CONFIG_NETFILTER_XTABLES) += x_tables.o xt_tcpudp.o
obj-$(CONFIG_NETFILTER_XT_MARK) += xt_mark.o
obj-$(CONFIG_NETFILTER_XT_CONNMARK) += xt_connmark.o
obj-$(CONFIG_NETFILTER_XT_SET) += xt_set.o
obj-$(CONFIG_NF_NAT) += xt_nat.o
# targets
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